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Table 2 Cluster validity indices

From: Building stock market resilience through digital transformation: using Google trends to analyze the impact of COVID-19 pandemic

CVIs Literature Evaluation criteria
Silhouette (Sil) Rousseeuw (1987) Maximized
Score Function (SF) Saitta et al. (2007) Maximized
Calinski-Harabasz (CH) Arbelaitz et al. (2013) Maximized
Davies-Bouldin (DB) Arbelaitz et al. (2013) Minimized
Modified Davies-Bouldin (DBstar) Kim and Ramakrishna (2005) Minimized
COP Arbelaitz et al. (2013) Minimized